del output\ota.bin
del output\fw_multi_part_spi-copy.bin
fsutil   file createnew output\ota.bin 10240          
copy     output\fw_multi_part_spi.bin output\fw_multi_part_spi-copy.bin
bin\cat  output\ble_app_ota_583.bin >> output\ota.bin   
bin\hbin output\fw_multi_part_spi-copy.bin output\ota.bin  

